Shunsuke FushikiHybrid Vehicle Engineering Management Div.
1
First generation Prius
Second generation Prius
Current Prius
2
3
Low fuel consumption
Hybrid system The new hybrid effect
Emotionaldriving
experience
4
High efficiency Compact andlightweight system
Excellent environmentalperformance
5
Fuel Efficiency Gains Achieved with the New Hybrid System
(km/ )ℓ
Fuel
con
sum
ptio
n m
easu
red
usin
g th
e Ja
pane
se J
C08
cyc
le
Current Prius
New Prius
5.0%
Engine
2.6%
Transaxle
3.2%
Motor
2.4%
PCU
5.0%
Hybrid batteryHybrid system management
Vehicle
40km/ℓTarget
6
Max
imum
ther
mal
effi
cien
cy
Firstgeneration
Prius1NZ-FXE
Secondgeneration
Prius1NZ-FXE
38.5%
Current Prius2ZR-FXE
New Prius2ZR-FXE40%
(%)
(Year)1995 2000 2005 20152010
45
40
35
30
: Toyota gasoline engines : Competitors’ gasoline engines
Improvements to maximum thermal efficiency of engines over time
7
Reduced friction
Toyota-first dual cooling system
Improved combustion and knock control
Maximum Thermal Efficiency of 2ZR-FXE Engine: 40%
8
Power split device
Motor
Parallel motor reduction gear format
Generator
Mechanical loss reduced by approx. 20%
Length reduced by 47 mm
New Multi-Axis Transaxle
9
Loss reduced by over 20%
Weight reduced by over 20%
Compact and Lightweight High-Output Motor
Development of rolling-coil structure
10
Loss reduced by approx. 20%
Size reduced by 33%
Auxiliary battery moved to engine compartment
Engine
Auxiliary battery
Upper cover
Inverter case
Smoothing capacitor
Converter case
Lower cover
Control circuit
Current sensor
Power stack(cooler and power cards)
Reactor
DC/DCconverter
PCU
Newly Developed PCU
11
Newly Developed Nickel-Metal Hydride Battery
12
0
0.20
0.40
0.60
0.80
1.00
1.20
1.40
30
32
34
36
38
40
Batte
ry v
olum
e
( )ℓ
Size reduced by 10%
10%
35.539.4 1.281.00
28%
Current Prius New Prius Current Prius New PriusNote: assuming a battery temperature of 25℃
Newly Developed Nickel-Metal Hydride Battery
Charging performance improved by 28%
Amou
nt c
harg
ed p
er u
nit o
f tim
e
13
Improved output
Newly Developed Lithium-Ion Battery
14
+110mm
-55mm
Luggage area502 ℓ(+56 )ℓ
Battery
Current Prius New Prius
Luggage area capacityℓ56 increased by
NiMH & Li-ion
Relocated Battery
15
Vehicle speed(km/h)
Time
(rpm)
Engine speed
Higher frequency of engine stops
Higher Engine Stop Speed
16
Engine
Transaxle
Hybrid battery
PCU
Motor
4%
28%
13% 16% 13%
26%
Hybrid system management
Per-unit Contribution to Improvement in Fuel Efficiency
17
Rear transaxleRear motor
Rear inverter
Hybrid battery(also on 2WD models)
New E-Four System
18
TimeRear-wheel
torque
Setting off and
accelerating
Standard driving
patterns
Slippery surfaces
(snow, etc.)Deceleration
New E-Four Driving Mode
19
More Enjoyable Driving Experience with the New Hybrid System
20
Key elements of an enjoyable driving
experience
Peace of mind
Smooth driving experience
Light, responsivedrive
21
Highway on-ramp
Driving in residential areas
Smooth driving experience
Peace of mind
Light, responsive drive
22
Peace of mind
Smooth driving experience
Light, responsivedrivePeace of mind Light, responsivedrive
Key elements of an enjoyable driving
experience
23
Acce
lera
tion
Accelerator pedal stroke
Power mode
Normal mode
New eco-mode (equivalent to current model’s normal mode)
Region emphasizing enjoyableacceleration performance
Smooth Acceleration
24
Peace of mind
Smooth driving experience
Light, responsivedrive
Smooth driving experience
Light, responsivedrive
Key elements of an enjoyable driving
experience
25
Current Prius
Pitch Excessive
New Prius
Acceleration (G)
Vehicle pitches unstably.
PitchMinimized
Minimizing Pitch when Accelerating from Start
Acceleration (G)
26
Key elements of an enjoyable driving
experience
Peace of mind
Smooth driving experience
Light, responsivedrivePeace of mind
Smooth driving experience
27
6 80 2
Engi
ne s
peed
4 10 12 14
Time
New PriusCurrent Prius
Responsive and Linear Acceleration
28
Sports driving conditionsNormal driving conditions
Ahead
Behind
Left Right
New Driving System
29
Engine speed needsAc
cele
ratio
n Vehicle speed
Improves acceleration in line with the driver’s needs
Engine braking needs
Controls engine braking in line with the driver’s needs
Dec
eler
atio
n
Vehicle speed
Sharp
Improved responsiveness
New Driving System
(m/s )2 (m/s )2
30
Targeted fuel efficiency of 40 km/ℓ
Fun to drive
Compact and lightweight system
New Hybrid System
31
32
Beautiful Hybrid
33
34
35
36